Integrating Selective Herbicide and Native Plant Restoration to Control Alternanthera philoxeroides (Alligator Weed) Page: 32
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opportunity for native plants to become established as A. philoxeroides cover diminished. In this
study, A. philoxeroides was sprayed at maximum rate in October. Late season applications of
herbicides tend to work better because plants tend to accumulate carbohydrates and other
nutrients into roots and other storage structures in preparation for winter senescence (Madsen
and Owens 1998). Because A. philoxeroides suppression through introduced native plants after
herbicide application was the intended goal of this study, early season applications and plant
introductions may have provided different results.
Herbicide applications effected A. philoxeroides cover in the field. There was no
significant difference between one and two applications. Late season applications in general are
more effective than early season applications. Allen et al. (2007) found improved reduction in A.
philoxeroides biomass with July triclopyr applications as compared to April applications. In this
experiment, the two triclopyr applications in the field occurred at the beginning and end of
October. The first application on October 1st may have resulted in maximum potential effect for
the remaining growing season. If the project had occurred earlier in the spring, a second
application may have provided improved control.
There was no evidence of introduced competition alone effecting A. philoxeroides cover
in the field. Due to availability of viable plants, different species of Polygonum and Carex as
competitors were substituted moving from the greenhouse to the field. This in effect broadens
the range of potential competitive influence of different plants on A. philoxeroides examined in
the context of this study by two species. Unlike the greenhouse component, native plants and
seeds were present in all treatment plots during the entirety of the field experiment. Any effect
caused by the introduced plants may have been overshadowed by effects of plants already
present. Below ground aspects ofA. philoxeroides were not measured in the field, and therefore
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Adams, Justin. Integrating Selective Herbicide and Native Plant Restoration to Control Alternanthera philoxeroides (Alligator Weed), thesis, December 2011; Denton, Texas. (digital.library.unt.edu/ark:/67531/metadc103280/m1/39/: accessed September 24, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; .